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180RB Mountain Runner

Thermo fan setup

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Parts needed:

40A relay

on/off switch for in cabin (use something like a 5A or 6A switch for this, not higher)

wire

crimpers

female terminals (blue sheilded type)

solder and soldering iron

inline fuse case and 30A fuse

 

Intro:

thermo fan setup needs to be run by a relay otherwise it will fry the switch if you try to run that much power through it, so youll need a 40A relay and some decent wiring skills, the way i have wired mine in is theres a thermo switch at the bottom of the radiator, which is normaly used to activate the cluchfan, but yeah, ill refere to this later during pin 86's wiring, now, first things first, on the relay, there should be markings next to each pin, numbering them as...87a, 87, 30, 85,86

 

Instructions

find a constant positive in the engine bay to link with pin 30, then disconnect battery, this is important when using the wiring as a short can cause alot of damage to components and can do nasty things and give you electrical system ghosts

after disconecting the battery, continue

 

87a:not used

87: fans (each fan will have two wires going to it, ussualy blue and black, black is gound, blue goes to the relay)

30: pin 30 has two wires, one, joining pins 30 and 85, the other needs to be run to the positive batery terminal (use a 30A inline fuse here between the relay and the battery)

85: refere above, joined to pin 30

86: pin 86 also has two wires, one will run to the thermo switch on the bottom of the radiator, the other wire from the thermo switch will be grounded, which leaves us with the other wire coming from pin 86, this will need to be run into the cabin where you can mount a switch so you can turn the fans on manualy, then from the other side of the switch, goes to ground.

 

testing

so theres the wiring of it sorted, a few points before your done, are the fans blowing the right way? if its pushing the air to the front of the car, instead of through the radiator, swap the blue and black wires over, should then be corrected.

next, is does the switch you put in the cabin turn the fans on? if no, recheck the wiring. if yes, turn the fans off using the manual switch in the cabin and let the car warm up, once it reaches just over operating temps the fans should still kick in as the thermo switch in the radiator is there (mainly as a back up but can be wired this way if you dont require the manual over ride switch which i recomend for track day cars where temps are pretty extreme and cooling in the pits or between drift laps is required. if you dont want the in cabin switch, then its as simple as using one wire on pin 86 and running it to the thermo switch in the radiator) if it still kicks in on the manual switch and the thermo switch, then your done, hope this helps alot...

 

if there are questions on this, please PM me and i will get back to you as soon as posible...

please do not attempt this if you are unsure then wait till you have enough info to feel comfortable with what your doing

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your wiring post is very good. but just want to ask something. i have a 180 sr20det with standard size alloy radiator, but am unsure what size thermo fans to get? i was told get twin 12inch fans. also how is the mounting of the fans to the radiator fitted. any help pleaseee..

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i have twin 12inch fans from a w12 avenir i think paired up with a mushimoto radiator, i also have a nismo low temp thermostat. the car doesnt get over 100deg F, which is about 65-70deg C i think. so yeh its pretty good, have the thermos setup the way 180RB has posted. Make sure the polarities are correct otherwise the coolant will boil out of the overflow bottle, especially if you have standard radiator.

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Got any pictures of this install? Very good wiring write up. My only concern is I have the standard viscous fan (obviously will get removed to install this), will my radiator have the thermo switch required?

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your wiring post is very good. but just want to ask something. i have a 180 sr20det with standard size alloy radiator, but am unsure what size thermo fans to get? i was told get twin 12inch fans. also how is the mounting of the fans to the radiator fitted. any help pleaseee..

 

want 2 know the same things. i just replaced my standard rad with a dual core and want to know bout size selection and mounting ie front or back better?

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your wiring post is very good. but just want to ask something. i have a 180 sr20det with standard size alloy radiator, but am unsure what size thermo fans to get? i was told get twin 12inch fans. also how is the mounting of the fans to the radiator fitted. any help pleaseee..

 

want 2 know the same things. i just replaced my standard rad with a dual core and want to know bout size selection and mounting ie front or back better?

 

ive got a 180sx with an rb25 inside.. Got an aftermarket radiator as well. My mates swear by getting a 16inch thermo fan and if your looking at front of car the left hand side of the radiator is where you mount it. If you can fit it in behind the radiator this is better as mounting at the front disrupts airflow due to thermo fan by being in the way. So left hand side behind the radiator single large fan.

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